Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0fec9d4ee0e879a388a57b307029af82e22cff0ffcbe33855cb58f20f84022e' 
  AND token = '6QrRoe3GnXNdMDKNPkQwwZC+6cxtfxhwNdIJfcTeSMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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