SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0d9ac2016052097941ac04f7d76e9e3bd506ef3c756715f3a3b48f9be84f1d' 
  AND token = 'hZ6/Nw2yFJMwD9ap7Tz5jmDGDxIEDr34lBpsYA+Xo0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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