SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b658760a6a8eec2678157f23b277027d2ff0d4621906320aaba35558f5f242' 
  AND token = 'rts6I+Yh9oJuiLXN0YGjoQ1qrq/LllHVDGxKGjnJGj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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