SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94873ead49b87c999404d8f039f3f48c826990a8c7747dbd23f513e740a52d5' 
  AND token = 'jH1IokeR5rmljgK6+62ax3eAuHpyZ/JWqoxzVjm6UAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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