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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6cc66fd29f9d77f181696fcd9b89beea8d8c6b70f6a8d05f82860983d7bd96' 
  AND token = 'CrhVDKbVeeJ7EERMLa9yE5JOZ+SQJ+kImA/ddDi48vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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