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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea0ff4298cd42a66073a74c87df0c7af88777c74e1b8b7f6d825619f3a7ce6d' 
  AND token = 'LTdAsIg2cp/ZzZa5OEvdK/WVSAY57vheV6QtCLD8sGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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