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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bfc5bf058a988b4d2664813c5fda2f7a31879af9ea69222fb3eb3eb8eeca6b5' 
  AND token = 'U5kb3/yaWUsU7qQuguNBxfxY+YTb2C49WQFcqwEeBzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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