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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e6fa455866ceb8388c5ff494f1d8ea48d7d4c8b951a452d769de0f3dbf4231' 
  AND token = 'SviwaahW/sJBtzoZMveGBTcetrI8hijifdJDb/DXCyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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