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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e9bc4319c6160d18183564e3648f409dae9d0d2f680210363dc7e767137c72' 
  AND token = '2vnWJFeZg/Y6/5uTVk2fNNwGtYHxnvEu91qncfAS+VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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