Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b491dbfb0c386b97922dccd5edddabd8ebfcd1b45634c69cd0b10ded7a9cac' 
  AND token = 'vNt0WBHjsp+3Eo7U6ItQTgiRxtSGdjWpQxiQIr4IuCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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