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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96feacd3726a98ea0ec6864a35c5e3c1face636031b7c89a03007c7e36c16a88' 
  AND token = 'WS1LkNS+zJMFqu3z8IrbQ4npw7O4UrxThV8HMvXvRV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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