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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab73680a2031c10b5024e41eaa9886e8bb2417cbd5fea29a6183fd8f815dda9' 
  AND token = 'mz8nQMOK2lcD+VKbGbICuFciZeL/jHJF3ERncFPree0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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