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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c4faf9d5afd7f302f655f3c3cd05f36b5d13f58c86c0005a42c4a821c81c14' 
  AND token = 'VVxdVbM1vswbnGHBUkZxsg//p0b60BtaAnueLMdYf+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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