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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40de4fd332fa18e5f49b248f7684ab888c41af65b8c99161e46456f3b0a06958' 
  AND token = '1QESlE5EuF6FG0ZPEIjk9yMypjQxg3cEIu/i3URCNEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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