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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4799901d5d21c8c507f7796bd69f7867079a21b5d8e4a8d2675ca13f609f09' 
  AND token = 'zXIr06DfFclTgGBTw+FQTG0T7PaXBiYfs10jWfq9+MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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