SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18bad4b73c3be82878c7d01e2956d791f74800de23cc91efd3732cd51adc7203' 
  AND token = 'vwKBr/mBFmA6w+xui/u+mQWp+XBqoLy8/sh9xpM9JX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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