Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d8e062e225895b1ca9cc6a2a0098e2df019d5bc27cd2932c22f0e6ad45ed0d' 
  AND token = 'FUfMCMSvq5VzFnO3U01HijqC+EQczrvEtZ6qoKn303I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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