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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5d81cd74b2aa86d28eb1f5868bfc82b03d5b1fe549ee426a8d66da81d3b416' 
  AND token = 'jBeAP07C9SYijVj1B9ojz5GWJLNf3huLobeyCsmZSXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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