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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36e37b70e6b1d605423f598d7df42ef5b95f5980dfbd9b77475d52024c81cf7' 
  AND token = 'yFbIK7a16OBmwH8Ryk6+gEw4kYOJgEi7bAjSn9WCBsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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