Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecdb57f7943aafdc0ca97ec95bbd4aa808d42171faa0a4dc8f8c2197e7c8db84' 
  AND token = 'SwQhPLwewc4O4IF5tTzOtWdo//ag57nl4117+PVB92k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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