SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e179ff1d1f196c19e54fae2db27b7468527ed7f1f17bb6ac0c0a9f14b0073193' 
  AND token = '7PlSJ0bjuNUXHhJMHM5w0x5erKnZNYHmxiZLsxQLt+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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