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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8295191e74055d012e9e023f582b8c96cd36b47bb84c06b2b8643f9a678c0cff' 
  AND token = 'rBH1H7AWrfZ52CxbZiKS6DFcP45Nte+9cgxIhkvKqeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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