SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95865a2591dfe35eb196ae346ee0abd6565d3c2bd5b75cef3a92cd62771d93b' 
  AND token = 'L0RvhjX1rfbGZbLicEk5RCh53l48rSmY13iYtfkSgZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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