SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a59e0e9e92b4b222cc1466d68ab996a99d62bb52f034c34a2b72d2e10d973a6' 
  AND token = 'XooGlhOTxFZuL1LVLUjg5sfTVJIz/EJjxj3q37SmPSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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