SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642dd62702237c8c3a5f5fc89c79b94af1b15ee6d69419839b0ebba4d071d780' 
  AND token = '/jGZY9cjGlMuX+8cd/kw70zSowpQF1dWVlUSdIDKMdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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