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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96333afacf410d257ec1967b2500bb4b7c1084026b76e0ca1cbcb5a07f98308c' 
  AND token = 'kPko46YB9/wAYn9WXUGUxGajyNNvwktt8cvnnXc0YNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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