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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e4fd0eaa4ba3919b8e5ed5d51de46c7e3b156bd077bb8fd891abf6d5a344a96' 
  AND token = 'xR082BknfLt6U5R46MxVbXs46UNjEKHrr48gR+9Byhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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