SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d66c62e2a8aa13d6971e1b039cf74e4fb0708095393ebe99b29db6acb35cdb' 
  AND token = '8Oz1qKCGpWa0Esgt4qlTeX7vpP0MVsfCPGWKl5Rc5LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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