Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4ce321c8689fc0ae058a0e473eefbf6f0aa7df13f61b4da8f25fe9e74fe6ab' 
  AND token = '8csuKmBv+PwjIVRCeaOR3UBnaAvFg3LXCb18QV/05Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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