SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54fdb4f2625c3f8a5dc34db3bcc0409dad06ea21c95f59fc17b88070520e3327' 
  AND token = '1iagjBv3xKO7LkqzJUZthOyIozfQVNMfLs7glk3jo2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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