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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6adb3588343c453d43aab7e071bb68f069e967733b4d252a145499e6fda67818' 
  AND token = 'Vy1+TSxrJFwTzNaSEv7rvD7ElQoJLvXn51UZG2r5r3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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