SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d2117102e7e5fb9dc9fdf3a92c5400a35ec164f948ee1388a172f0dba96198' 
  AND token = 'OFNrqgoT44VGWAJKzhUW+iXkx1jrz9D5jGzSggRo7KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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