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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5feaac2e46617f4ad4a4e53221a44a7e00210ce1e6d5381f41caffaf8e1b81' 
  AND token = 'rGieNfWyTo6RPbawKVs+7KnlVOg0zJ9sEeYM3LrOGw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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