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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935212a332d6d944d52a45faca5d9f2707ed432e93171a334ded43f8688278a1' 
  AND token = '87ao4IxdqOlL26Zb9OgVfnSXWE0Rqt0RNvKRd2jqg24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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