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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ef8edb5c5fb55c441328f6ea72fb19ac8023ab9f6b8e21f7d2623bb9fff01f' 
  AND token = 'N+C7Y9C5jKPzjbsQfOU5Yoi3S47JxKhdrlN9F2eHf3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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