SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05445ea03ecfdf2645c8485bb58546a99e552bb95fff769d60572d15fb4d3bd' 
  AND token = 'AksJ33+1ishSVgX0K2nogLu/oYW8h5G7/E+YtNAYlww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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