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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7ccb5cc4105e6112a8abe759b0292e1c451d352979ab4080c161b8e17edbbc' 
  AND token = 'F5jIlXZuBFNXdmvgbzMqqTm+ISho/yC2874dbPKjwRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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