SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1003117bc3fc4502db0c0ce17c0cf0aba5c71261e3d97adcf9484a471f75b63a' 
  AND token = 'VwAB7WmhgTDCzqGQri0QPXp3BLrjY5iGUkDGIKbqzKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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