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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a20802010af1735425373b6271d4bbb41573bc3bb26bd2eb4ca53eabebf10df' 
  AND token = '88PM4Hm7W09frnxehVAF/CNFFDzjk3b7GnOZgJC7lEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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