Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d23518437d8d8487c843b2a82bac32b3a40bf17abfd57489ff3b3083b73a33' 
  AND token = '2dzT9+1wUQjwk1XPSVd/pWZ//d8yjaxBwUz6r97aZj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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