Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a696b1354a688b6afad50b1efc292a553e5797bffe59cd63de41152430b4b6a8' 
  AND token = 'w6xuySqv30R/lRNK5hNGqVHcyjxg2siANgtAQlf1jkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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