SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fd44a65b60a554aa546879f2c8af83eb6e8c9bc70c9070de3f12d1365c6acd' 
  AND token = 'wb9Ppi7vvL7OaCcXuJgtHImvwjb6zAXc8skUnCV8Zq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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