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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2606190367c70405e1ba594afe84c6265dc1fc83378394e2785042a7f883ea77' 
  AND token = 'sFba3PJ1NWFoH7vCzTKqd2pU9eE6eS7adP/pTAYnAMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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