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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafa9f93f7388a9e5728925e5f1fc4f5049f164e232295fc137ecec860117502' 
  AND token = 'swBTHPSWuXsQU8DGt/sSHyNdwyVNUAWSe/lkS9Vi/+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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