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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f93b8bcaa4ce4573dc539f22f9ee96f0590f18ca15a8c996b0d257b7116a184' 
  AND token = 'cGb9l1pODaRVxBWdv0ZXaIeXm17ZHfKAl6/tpBBhK/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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