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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a32f80693a9af27e1a6d2502cf8480f549efcbfd502836f265af1bf8dbaca94' 
  AND token = 'at+KTQxUANbp9D1/FRsn/YrdRCGlWXUDjZfjKsXo+3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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