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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b530af1e8eec668bc3230c1541a168b48829dcf00795e561ad2bebed5ceb30' 
  AND token = 'nMQS02Id0t3WVe4pngo32hgNT/YwXx0hKXkrJ6M9ZWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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