SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954f15f1141a4f627fcd5249a677e7ffd4da7cf006e131b2e34b1853074f40b1' 
  AND token = 'DVIP4dZrdjPuZGBcixIGXv8QPOmYawYVGjuPYyk8g+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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