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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922753f45e708e7f60624d23212eed2b34c7bff03ef6e83a1accf9ec30c0ee90' 
  AND token = '5Ltvzh/iSTtOMjf3NsdLIwJnumUAuwM5e8a/DRP35YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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