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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08993ca1893bdf9ee58ab1925202a70c74cbfbfb3ad0b91f625b4d0c815553b' 
  AND token = 'lkS3C+b7H7PYyH8iGXW0KEp/ErTzCBY2ocuw8rMvvW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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