SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368e606fa72fe4d6bd6025a4f0a42b0102e1ff41937a4f05f72e96550e53c8e6' 
  AND token = 'F/IKW4tVCPyrBHq8o9e+Nhl8PYJjjFyYEFwEjvlJmbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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