SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ce606cfd8dda3f8903c735ddb153f2c3172d4728195fa8c663327599c5b99b' 
  AND token = 'JlmBVrYu3jzoCRg4Elb+KK1A0A6HI54eAJ+TdG6YVz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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