Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c17953dc3511df9d85e233da5d33e6b3ff45c02765432c69039dfefbef89e5d' 
  AND token = 'BCtGk/cmsCpZfh4iA/viGABBp6sOhOyi1nTsEfq2iFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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