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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31864bdce17d0cffeb444c056ca8b944a64ff8636877055a3ee6ac5bf9694c0' 
  AND token = 'oMQ/RQVVvRkfOUW+9m7WBtyU2tb91LPYhk/i3zArOzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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