SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3e32bcc94654d852cc07c6f17f78c985d82d4ee1f3c8b00b3a08f782df4386' 
  AND token = '/uF1w4WKJcZ+S3dsvqlLekxO8mGlo0wjIXKk6QT9ugE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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