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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c10324e115aa6ae125b19a1c9ccc2f9c40e46725e0bd2fce5971392882984a' 
  AND token = 'Ve5Qn9ppp7MkH5+o5o9p26YiIHo63b49GLgbdOnv5Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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