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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36677ce448898aba1e87efebeee56d441e343a8bff71fa021c245a455ba7711e' 
  AND token = '8rYEo/z5hfRoDvKfMny3crvNap2QorugP7PUcpaQaaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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