SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de6a5894e0218d330b6f84eec91b6924e9daf7373fc59db7038a72a07ca14f4' 
  AND token = 'z5nnKnCjVrzIbmqnTlGrbMjioYvqYmDFhK+GMt7J07Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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