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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a18973ca63f783ef6a79795a570115473b9f523453afb3c0c6ba13c450b8eee' 
  AND token = '0+cJFJmBTw5XHdDcZa08Cv3rfjjRft1JRIEWOg9pWaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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