Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d5df193b8506f5aa1876cfdaa9ff4726c3a4409daedae17d7ff9a9cda59336' 
  AND token = 'a47OEtcArNaEk9crhYvDsivi8QKZIf6CwDezyo0Ccds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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