SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570a24ab332b8241ff0c6e86f414791171cc4b6db4e8d9a453c98d74fd09f4b5' 
  AND token = 'mnSPgnDOLJ6PT/p67fY9+ALCJK3HpjoxY4SzNUR9vrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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