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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713f9bdaab4467d3e15d53e4b7da5cc8baf4cdc085ff13afc1dabf55a5bbdc03' 
  AND token = 'PKQ4RKeZSn8j6mCZLXTlSye4az1JextR0R6d/aUx3eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}