SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd11f2faf406b4934f0088c2ab60f8909ca175de12facd739df603afd70ef8b' 
  AND token = 'hG6yPhTzBhKKG1THSB2KyQLVKzYBv5eaFESEp9U+/Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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