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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf80433c854e9a4f9fc3c0f055f68c29d6dd745bb4d1cea4ee77c7a4595eccb' 
  AND token = 'WZjh0kbyIqsuiPkSZF270+0/UWqr1qfNmYjF+mRDir8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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