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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0868e7027549c65da054d6eadfb718528a7f03194624a87351d96659c57e93ee' 
  AND token = '03gdHBTz8beShDr6ip8baYRw6uoEc1hDF+e2VF05HPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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