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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f60961d3d09c9bda8e74e8c14a5eabf6803317e84dbeb210105cf740c85d4e' 
  AND token = 's/xR44lr5Z7gYLfgGD8qrOwcOkU5Gfg8CX+8lkXsKjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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