SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937b2d0175aa1417cf3620ad5e9a085f309b14b18d255de5133d26ffeb4f812f' 
  AND token = 'UAy0QgdOWyzDtoQrVs+5mKqrxtH3UJoBcBYumWG8BzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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