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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7a3f53ac8a3d9bea7bb1ad87ff33dbc8992ac42346f8a57086875d0b375bd9' 
  AND token = 'VzFQUL15EhVCdfOA0tE9INOHe2xEwqKYTw5qIrcJSNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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