SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1735668472dbbe7e7b1497d4cf5ba4a233758df052177ecb2ea682d2dbdfb6df' 
  AND token = 'J2UntMUqB/HqAf+sN0Uzjv3fnJcjwUKxDAhQPFKnarc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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