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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a35ae3f21a3f5e43b875a67074e506868b705954898c262944cabc7e7b4fd1' 
  AND token = 'xH1WlJ+epjE8NfYN2SJfFbVXKJ/ii00kB8xX68SXj5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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