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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24c2ce60bd08b791939646bdbeb6ea458837190f83a5c92f8f62736c3ca0d2b' 
  AND token = 'FxB06LtAhz2tO95h9KDAVd0K+2nbv+U43f+AHjmTqDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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