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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d795b879d1100d2fbd6099eb428fe904fa66707612d2231799bded2e462567' 
  AND token = 'liU5xO1r0zNci/4KaZuAJsZsKqBqmsOqKq1P7bZK65g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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