SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53477863465b23fefb95b2ef57afd7e45d81f01b570bf8a48604c3c48482c56' 
  AND token = 'zJdToCJMltIanHLBz8Iw0UOH9lk1zqyKfSLll/Pja9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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