SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bdd1972872ca7a54fbe4780c1b9cb298b46c16841edfa8e9f06f45b5b45f62f' 
  AND token = 'GBhNM6hjWPj0TPyEa/3gNiwW+7cKOSr6HLHtvqqRslw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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