SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b9beddc1c81a7c40d590d1920c36246b9b1ea704360d339ed8feb842999465' 
  AND token = 'w+VY0/rz7DZfYY/UuR9xj+vqY0+07v5t2eGGiJ6kvMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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