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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86592d638a71411fafde9d773ee1a18474d8b39e6dbc5d480b6870bdbedc28bc' 
  AND token = '2bTHMs0IwWIqHivNA/B2rvf0j1wxYUeui9jK2ckjg+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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