SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c56a92831c32f85c2627e21d4063b486b07f42ecc580e5af79479484067948d' 
  AND token = '6hcGA4z4GkN9pyVjJYanUdM1QouRavVYIuNdd8lznZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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