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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd312159b04cabd4c0084b0a4b62738ccf5003b6e44edf4c9648c9af0619f7cef' 
  AND token = 'VTGkd1qs7sFfk6khjkB93QUPDDPF5D/N/xb+7K6TnrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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