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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe31493da5ede6c69d10708b775064cee2f0a90bb74e0f1895e1dfd868476e0' 
  AND token = 'ASK8PABgzc1oP3tzlBLQMyqgN3QogI7fJ5fXX515VnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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