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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24fdf734dcbba0872b4a9400767a6f1938bf2ceeac9aca5c7618ec32ee066f4f' 
  AND token = 'W5C9fyyIpSs+U4PW5SYm50JCFzXb5zl6jp1DBc9RMQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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