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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c132baa65d4f85cec46dfa27d7ce3883e931fab070e1524adea69ccf191868' 
  AND token = '9EvR+47anM18ej57jNRm8Vcq8LNk7FKz5+L+ZXxs7Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}