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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997b1be05b2552f05a0e8b98d375f6b38f5cc5e8d0307419fb285495c4f39d14' 
  AND token = 'rAOhxEln5y+aFqRE086aXaIVuOYPrUrvtaHBl+ZVt3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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