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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311c9164083d98b23e5d9cde721b7ad63a492821b141efd12c6cfa8b2d40c34c' 
  AND token = 'IvVbCl8/uZ5yY/UZ5OTngbOQrDjkY/iC9cvna0nYJEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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