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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c36e1c9ae1ce2e22ff498c6cc8c24b4ed8b8bb3a049ca02a3a6669e5f4b677' 
  AND token = '3Lp5NrLGiB4tsWEWcUGjxeDU4cBz+3m69u29Dc8zLiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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