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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c69210cd38013ad373ccb079c1cb4749c03d28a08a09a416c55cca103af8b2' 
  AND token = 'xb6JIPNhEkWvP5x/ir4QZA1aWOf7vnqwtKUGhZQEx8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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