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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7272e400e5247dfb4bb7b3dbe2fe147b4fe581a0fb2648e465fe6e38152847' 
  AND token = 'U6Pe9Wipp/7316g+mNv7Jyogygq0DK3kEHymQAGiIsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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