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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72667d6088cb20583926f0835ba7706c84e1add75997674e7d1c2eae3fa9a70d' 
  AND token = 'lfuazS0a6K+um5jTKNiaIskZIYRB/Cdv580sV0mJFSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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