SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d1f3a436892d1f37565574ef1c369ae85e41a1aa0e8b557ef9235b5997fcc8' 
  AND token = '7UXdHwZJF6wc50U+QvKvwgy0pl3e0AFmqPYFBuNBZIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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