SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c4351b49f850a8026e3bf34186bc23a69d71371ea410f6f6409af32f92dd0a' 
  AND token = 'wSNpIyq0WWPuIK79nZerXMJ7Kd4TZ+yjZh/W5R6mEdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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