SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44723f5267f43507c58a6f7365fcc523bb79b5a3b743142a9de1e8e193f3003f' 
  AND token = '6hbCL2jL5VtKpYUtlv8V3J/DjL/0PuGm1botaiK3svY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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