SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58bdd882e5bde70f3d39b1ec53a0b38acab6302e9dd2116cf3f765b122c0b75e' 
  AND token = 'FdY4OexG0GkSLrLFnCYJ4ZQ+SBpVq7gCjtowj4tUxHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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