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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72efa04114e2b800489ce01455b9496ff3237fb9e3235b59ea5dc68ee84d4ebc' 
  AND token = 'xyYU/WOxppjw5msgOhTQ1A6bfADvW5ZfJ9dYcIJlimg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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