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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a570eae7dadc3badce1903dfc9d317c695ed6f7efc3f7593b825188cb18ac869' 
  AND token = 'T1lMggBhK/9kICApE4qLOVY7gX5pAQQNgW4nZ8dX2pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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