SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2216fbca14b54e7f51a80f77cddc454a865016a08c2034f177b77bda3abcd862' 
  AND token = 'sPHaHwr7pRScrTMJX88nOJ3nBmnYmrbzj3LBBQ4wBaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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