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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b31d8afe0b75a1bf0ca9479d415bbf4fce1aa667d5ea42e11a2ca296cd813d' 
  AND token = '+kkg6C/wAyfxeIis2NwS6d+VcxmQRMB1sMNpVhBUoFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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