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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9824090b7f65cdcb81e065d24d3451db8f867ce0795295676df150dbe5817634' 
  AND token = 'TLxrEXeZqRtcFpopxfoRxRMTTKaBwDuQU69/dPqzflU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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