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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd119beda2bbd72bb829368a92f8647bd2ea684c0a2dc7d0d586ee6b61d67cdca' 
  AND token = '/DsxwnEWceL3s2MKOinleKeI31tTYHgttftoOfiIij8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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