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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902449aa309a34164eac02754f572c4f7c00e644a9b1fcccab6802ccdab9e64e' 
  AND token = '0WPd6TWugmESpGGB+wHXaOw6DvMSHuzcpYAlOXCpCAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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