SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ae65ad2b210ef836fcbb46d56526007a14ad1854c96161a039483ef4d3499f' 
  AND token = 'w6uGFKqmG8BpnoHCxyqxiJz5GknM0KCjJaYlJkU7tv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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