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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ab9b16c75e1a0656ae2386b78c58dc76681f8c792e86c6ac158d55f7de58a5' 
  AND token = '0DYQUJo6/iQ5MS+6c0nlvUThckdVxEURRU3AuHnsSkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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