Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c75e9f09de2dd4d5c29c964dce1e864ed1bceac4948a1db75e37893340c853' 
  AND token = 'Ot8xRC8SriTcL2j5FeCa0KrjrnaCDNOtb2lyPWU0GzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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