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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2a7fb3153ccd75c6ae0c3d323b5286ac71e42ec4ed29804eb26412dd022a00' 
  AND token = 'F9CCb46vpVELvFgHFuY42jBX5L30betVIHu/ogX590U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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