SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908213ee6917e445af906d49f7c1ffb51de98524f7ae0513379595ec3a08223d' 
  AND token = 'JNtbjZAnGY4f+v3LBcFi3+O27qgF6PPuA6uHrKAhIpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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