SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32af5d9a714b126bd02fd3467158539057dee1b6418084059cdec203e015712' 
  AND token = 'lMJrpgfKXw2m/G8FrChqr65bKvBcG5cRbinor/sYZEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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