Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98aa793984472746bbc2df3c01e4c18743fd2a42e999eeee18c934f0955f8cc1' 
  AND token = 'rxIAPyE4BUjsLn4wTkcmFq3w0OuDuK9JQK5oIy5qQKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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