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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd79758e390f33303b4918b703590de048ec8e5b8d1776210c3115119019d45' 
  AND token = 'DmhzAzuGzatM/alRqugVWoLdHQe1EB2Z8DLjIIu1B4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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