SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dab459b248cd4897093431ae3aa668af681691ef75e23c6d96875c7743a0ba1' 
  AND token = 'fYLFNmKpPuzjrOiG0nrsf/LYDMqiI5J0DCH58SL8hAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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