SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4f03ffb9457c59c952a76cd3d7063986c1e5eaf0492fd8f16d96195d4ef5d3' 
  AND token = 'kX9huvYPqGjKBQPr2iZXsSAVlPFZ5+0KRwpEmGvKyXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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