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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f50827ab0064be18d06b3d7ef8a109c3ff57b10dce097ec79bb0681485cb30' 
  AND token = 'Gk1BgykMg0xdgA9o5bCZNbwgZ9XX6MXL/WsLv7NPazI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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