SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e16ff7a93b90c4d5b7a4e1f7906cff8c32d671253e9900de2144db3e380982e' 
  AND token = 'lxY0UtWtXsVwIu/8gGhJqicq2uYGyzue51Hf9L4ZJAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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